A multifunctional data mobile power supply (01) and a charging method thereof are provided. The power supply includes a gear selection switch (02), a main control chip (03), a mobile power supply module (04) and an interface module (05). The gear selection switch is configured to select different operation modes for executing by an opening and/or closing operation. The main control chip is configured to detect a gear selection signal of the gear selection switch, and after the charging mode is selected, send an operation command to the mobile power supply module. The mobile power supply module is configured to charge an intelligent mobile terminal which the interface module is connected with after receiving the operation command. The interface module is configured to connect with the external device.